Answer:
Therefore,
The resistor value , R is 9.4 kΩ.
Explanation:
Given:
A neon gas tube has
Von = 60.0 V and
Voff = 30.0 V
Capacitor, C = 20.0 μF
Battery , E = 120 V
Frequency = f = 30 hz
To Find:
Resistor , R =?
Solution:
Time period of the wave will be only the charging time of the capacitor,the capacitor will be charged to Von from initial voltage Voff is given by,
Where,
R = Resistance
C =Capacitance
E = Battery in volts
ln = natural Log (Sign)
Substituting the values we get
Therefore,
The resistor value , R is 9.4 kΩ.
The answer i think is (B)
It will accelerate. A force of magnitude <em>F</em> exerted on an object of mass <em>m</em> applies an acceleration <em>a</em> according to
<em>F</em> = <em>m a</em>
Remember that force and accleration are vector quantities, so the object's acceleration would point in the same direction as the applied force. The other choices describe some possible outcomes, but
• it the object starts in motion, it can only stop moving if the force opposes the motion and acts in the opposite direction. The object would eventually stop, but only for an instant before changing direction and starting to move again. Consider a ball being thrown directly upward, reaching its highest point, then falling again.
• its speed (which is a scalar quantity) would only decrease if the object starts in motion and is slowed down. But if it starts at rest, its speed can only increase. Consider a ball being dropped from some height and gaining speed as it falls.
• its velocity will certainly change, but can only increase if the object is at rest, or if it's already in motion and the force points in the same direction.
Answer:
Principal focus of a concave mirror. The principal focus of a concave mirror is a point on its principal axis to which all the light rays are parallel and close to the axis converge after reflection from the concave mirror.
Focal length of a concave mirror. The focal length of a concave mirror is the distance between its pole and the principal focus
The reflecting surface of a spherical mirror forms a part of a sphere. The centre of this sphere. This point is called the centre of curvature of the spherical mirror. Center of curvature can also be defined as the point in the centre of the sphere from which the mirror was sliced. It is represented by the letter C. Please note that the centre of curvature lies outside the mirror's reflecting surface. The centre of curvature of a concave mirror lies in front of it. However, it lies behind the mirror in case of a convex mirror.
If a concave mirror were thought of as being a slice of a sphere, then there would be a line passing through the center of the sphere and attaching to the mirror in the exact center of the mirror. This line is known as the principal axis.
Evaporation process is by which water changes to gas or vapor.
The primary pathway that water moves from liquid state back into the water cycle as atmospheric water vapor.